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MATH 107 FINAL EXAMINATION SUMMER 2020

10/08/2020 Client: tiger Deadline: 10 Days

College Algebra MATH 107


Page 1 of 11


MATH 107 FINAL EXAMINATION


This is an open-book exam. You may refer to your text and other course materials as you work


on the exam, and you may use a calculator. You must complete the exam individually.


Neither collaboration nor consultation with others is allowed.


Record your answers and work on the separate answer sheet provided.


There are 30 problems.


Problems #1–12 are Multiple Choice.


Problems #13–21 are Short Answer. (Work not required to be shown)


Problems #22–30 are Short Answer with work required to be shown.


MULTIPLE CHOICE


1. Determine the domain and range of the piecewise function


2. Solve: 11+ 2x = x − 2


3. Determine the interval(s) on which the function is increasing.


4. Determine whether the graph of y = 9+ x is symmetric with respect to the origin,


the x-axis, or the y-axis.


5. Solve, and express the answer in interval notation: | 5 – 6x | £ 13.


6. Which of the following represents the graph of 2x − 7y = 14 ?


7. Write a slope-intercept equation for a line parallel to the line x – 4y = 6 which passes through


the point (–8, 3).


8. Which of the following best describes the graph?


9. Express as an equivalent expression: 3 log y + log 1 – log (x + 2)


10. Which of the functions corresponds to the graph?


11. Suppose that a function f has no x-intercepts. Which of the following statements MUST be true?


12. The graph of y = f (x) is shown at the left and the graph of y = g(x) is shown at the right. (No


formulas are given.) What is the relationship between g(x) and f (x)?


13. Multiply and simplify: (8 + 3i)(2 + 5i). Write the answer in the form a + bi, where a and b are real numbers


14. Solve, and write the answer in interval notation:


15. A can of soda at 82° F. is placed in a refrigerator that maintains a constant temperature of 35°


F. The temperature T of the soda t minutes after it is placed in the refrigerator is given by


T(t) = 35 + 47 e  – 0.058 t       Find the temperature of the soda 10 minutes after it is placed in the refrigerator. (Round to the


nearest tenth of a degree.)


16. Find the value of the logarithm


SHORT ANSWER, with work required to be shown, as indicated.


22. Let f (x) = x + 3 and g (x) = x – 5.


(a) Find ) . Show work.


(b) Find the domain of the quotient function


g


f


. Explain.


24. Find the equation for a line which passes through the points (5, 2) and (8, –7). Write the


equation in slope-intercept form. Show work.


25. A salesperson earns a base salary of $1,475 per month and a commission of 8.4% on the


amount of sales. If the salesperson has a paycheck of $4,637.60 for one month, what was the


amount of sales for the month? Show work.


26. Let f (x) = 5x2 – 4 and g(x) = x – 2.


(a) Find the composite function ( f o g)(x) and simplify. Show work.


(b) Find ( f o g ) (−2) . Show work.


27. Find the exact solutions and simplify as much as possible: 8x2 = 6x + 1. Show work.


28. Given the function


1


( ) 4


7


f x = − x , find a formula for the inverse function. Show work.


Summer, 2020


23. Points (2, 1) and (6, –5) are endpoints of a line segment.


(a) What is the length of the line segment? Give the exact answer, no decimals, simplified as


much as possible. Show work.


(b) What is the midpoint M of the line segment?


Both parts of this problem are asking for composition


or evaluation of functions, not multiplication.


(c) Given the point M you found in part (b), state the point symmetric to M about the y-axis.


Do not multiply here. Evaluate the quotient function.


College Algebra MATH 107

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